#include <stdio.h>

int main0()
{
    int a = 0;
    int *p = &a;
    int **pp;//二级指针，指向指针的指针
    pp = &p;
    **pp = 10;
    printf("%d\n", a);
    return 0;
}

int main()
{
    int a[10];
    int *p = a;
    p[0] = 0;
    p[1] = 2;
    int *b[10];
    int **p1 = b;
    p1[0] = NULL;
    printf("%lu\n", sizeof(p1[0]));
    return 0;

}
